Whole red peppers - 1/4 kg
Coriander seeds - 1/4 kg
Toor Dal - 200 g
Gram dal - 200 g
whole black peppers - 25 g
asafoetida - a pinch.

or

whole red peppers - 10 cups, coriander seeds - 10 cups, toor dal
- 1 cup, gram dal - 1 cup, black peppers - 1/4 cups, asafoetida
powder - 1 tsp. 

Dry the above ingredients in sun and grind into a nice powder.
And keep it in a air tight bottle and use whenever you make sambar.